网格不适合小米的屏幕

Question

我有一个有点不寻常的问题，在我执行的搜索中没有发现任何引用。

我有一个Xamarin Forms应用程序，在登录屏幕上，Grid不会根据布局进行调整，也不会在屏幕上显示任何控件。

为了更容易理解，我将背景图像替换为纯色图像，从而使屏幕尽可能简单。

我已经多次更改登录屏幕，但都不起作用。我尝试过网格，没有网格，有线的网格，没有线的网格，网格的每一行都有一个Stacklayout，一个Stacklayout，有框架，没有框架，但什么都不能解决。

最糟糕的是，在firebase上进行的测试中，他们没有发现任何错误。

这只在一些小米上发生(在其他设备上，即使是小米，也不会)。

我使用的是VS 2019和Xamarin Forms 4.8.0.1269。

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<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:controls="clr-namespace:MySample.Controls"
BackgroundImage="solid.png"
x:Class="MySample.Views.LoginView">

<ContentPage.Padding>
    <OnPlatform x:TypeArguments="Thickness">
        <On Platform="iOS" Value="0,20,0,0" />
    </OnPlatform>
</ContentPage.Padding>

<ContentPage.Content>

    <Grid x:Name="gridExterno" 
          RowSpacing="0" 
          ColumnSpacing="0" 
          Padding="30,20,30,5" 
          BackgroundColor="White"
          Margin="30,5"  
          VerticalOptions="CenterAndExpand" HorizontalOptions="Center">

        <Grid.MinimumHeightRequest>
            <OnIdiom x:TypeArguments="x:Double" Tablet="600" Phone="300" Desktop="300"/>
        </Grid.MinimumHeightRequest>

        <Grid.MinimumWidthRequest>
            <OnIdiom x:TypeArguments="x:Double" Tablet="800" Phone="600"  Desktop="600"/>
        </Grid.MinimumWidthRequest>

        <Grid.WidthRequest>
            <OnIdiom x:TypeArguments="x:Double" Tablet="800" Phone="600"  Desktop="600"/>
        </Grid.WidthRequest>

        <Grid.RowDefinitions>
            <RowDefinition Height="3*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <Image Grid.Row="0" Source="logo.png" VerticalOptions="Center" HorizontalOptions="Center" Margin="0,10,0,10">
            <Image.WidthRequest>
                <OnIdiom x:TypeArguments="x:Double" Tablet="350" Phone="300" Desktop="300"/>
            </Image.WidthRequest>
        </Image>

        <StackLayout 
                Orientation="Vertical"
                Grid.Row="1"
                VerticalOptions="Center" 
                HorizontalOptions="Center" 
                Spacing="15" 
                Margin="10">

            <Entry x:Name="EntryLogin" 
                       TextChanged="OnEntryLoginTextChanged"
                       MaxLength="20"
                       Text=""
                       Keyboard="Numeric"  
                       HorizontalOptions="FillAndExpand">

                <Entry.WidthRequest>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="400" Phone="300" Desktop="300"/>
                </Entry.WidthRequest>

                <Entry.HeightRequest>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="75" Phone="50" Desktop="50"/>
                </Entry.HeightRequest>

                <Entry.Margin>
                    <OnIdiom x:TypeArguments="Thickness" Tablet="0,0,0,20" Phone="0" Desktop="0"/>
                </Entry.Margin>

                <Entry.FontSize>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="30" Phone="20" Desktop="20" />
                </Entry.FontSize>
            </Entry>

            <Entry x:Name="EntryPassword" 
                        Text=""
                        MaxLength="20"
                        IsPassword="True" 
                        HorizontalOptions="FillAndExpand">

                <Entry.Margin>
                    <OnIdiom x:TypeArguments="Thickness" Tablet="0,0,0,20" Phone="0" Desktop="0"/>
                </Entry.Margin>

                <Entry.WidthRequest>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="400" Phone="300" Desktop="300"/>
                </Entry.WidthRequest>

                <Entry.HeightRequest>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="75" Phone="50" Desktop="50"/>
                </Entry.HeightRequest>

                <Entry.FontSize>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="28" Phone="20" Desktop="20"/>
                </Entry.FontSize>
            </Entry>

            <StackLayout Orientation="Horizontal" Spacing="16" HorizontalOptions="FillAndExpand">
                <StackLayout.Margin>
                    <OnIdiom x:TypeArguments="Thickness" Tablet="2,0" Phone="0"  Desktop="0"/>
                </StackLayout.Margin>

                <CheckBox x:Name="ckRemember"/>

                <Label Text="Remember Me" VerticalOptions="Center">
                    <Label.FontSize>
                        <OnIdiom x:TypeArguments="x:Double" Tablet="26" Phone="18"  Desktop="18"/>
                    </Label.FontSize>
                </Label>
            </StackLayout>

            <Button  x:Name="btnEntrar1" 
                                Text="Enter" 
                                BackgroundColor="{StaticResource ButtonPrimary}" 
                                Clicked="OnLoginAsync"
                                TextColor="White" 
                                HorizontalOptions="FillAndExpand">

                <Button.WidthRequest>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="400" Phone="300" Desktop="300"/>
                </Button.WidthRequest>

                <Button.HeightRequest>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="75" Phone="50" Desktop="50"/>
                </Button.HeightRequest>

                <Button.FontSize>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="18" />
                </Button.FontSize>

                <Button.Margin>
                    <OnIdiom x:TypeArguments="Thickness" Tablet="0,15,0,0" Phone="0"  Desktop="0"/>
                </Button.Margin>
            </Button>

            <Label x:Name="lblVersion" 
                VerticalOptions="End" 
                HorizontalTextAlignment="Center" 
                HorizontalOptions="Center">

                <Label.FontSize>
                    <OnIdiom x:TypeArguments="x:Double" Tablet="20" Phone="16" Desktop="16"/>
                </Label.FontSize>

                <Label.Margin>
                    <OnIdiom x:TypeArguments="Thickness" Tablet="0,0,0,10" Phone="0,3,0,5"  Desktop="0,3,0,5"/>
                </Label.Margin>
            </Label>
        </StackLayout>
    </Grid>
</ContentPage.Content>
</ContentPage>

Answer 1

将x:Name="gridExterno" HorizontalOptions更改为HorizontalOptions="CenterAndExpand"